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Hmmm I am guessing you are running an SR. I below you are getting mixed up between the turbo elbow(turbo extension) and the downpipe. The downpipe connects to the turbo elbow which connects to the compressor side of the turbo. The elbow, has a separate chamber which greddy and HKS offer. Greddy has a split plate inside the elbow, where as HKS actually is two separate tubes which collect into a single downpipe. The split chamber is suppose to offer faster spool because it has less turbulence as it funnels down into the downpipe. The turbulence comes from the exhaust gas and internal wastegate. In theory they say separating it helps and that is why greddy and hks do it. No other company really does.
Downpipes are made by everyone almost lol. Megan, blitz, hks, greddy, tanabe, rsr.... pretty much every company has one. The trick is to find the one from japan, forgot to makes it, but instead a round pipe going into your cat or exhaust, it flattens out for better ground clearance. As per performance on a downpipe, I guess bigger is better? 3"? lol..... O btw, blitz is the only one that does mandrel pipe bends for their downpipes and exhaust. If you dunno what is mandrel bend, please google it.
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